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-rw-r--r--fs/autofs4/dev-ioctl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 3182c0e68b42..232e03d4780d 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -103,6 +103,9 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
if (tmp.size < sizeof(tmp))
return ERR_PTR(-EINVAL);
+ if (tmp.size > (PATH_MAX + sizeof(tmp)))
+ return ERR_PTR(-ENAMETOOLONG);
+
return memdup_user(in, tmp.size);
}